c# - IBodyModelValidator Are you missing a type mapping? -

i getting below error, reason.

i have created 1 new controller, other controllers working fine.

error:  resolution of dependency failed, type = "system.web.http.validation.ibodymodelvalidator", name = "(none)".  exception occurred while: while resolving.  exception is: invalidoperationexception - current type, system.web.http.validation.ibodymodelvalidator, interface , cannot constructed. missing type mapping?  -----------------------------------------------  @ time of exception, container was:      resolving system.web.http.validation.ibodymodelvalidator,(none) 

and falling @ below line.

public object getservice(type servicetype)         {             if (this.container == null)             {                 throw new objectdisposedexception("this", "this scope has been disposed.");             }                  try                 {                     return this.container.resolve(servicetype);                 }                 catch (resolutionfailedexception)                 {                     return null;                 }             } 

may not clear question, please let me know.

i replaced

using system.web.mvc;  

with

using system.web.http; 

and worked.